Between the decades of Africans independence from 1960 to 1990 more than 80 violent changes of government have taken place. When South Sudan gained independence in July 2011 the debacles and legacies of years of political trend and previously independent African states political tensions was anticipated to be taken as firm lessons. Nevertheless the reverse has happened and since South Sudan’s independence, the world has mostly received bleak news up until the signing of the August 2015 peace accord and the return of the fugitive first vice-president on April 26, 2016. Before the signing of peace accord and the formation of Transitional government, South Sudan has faced gloomy reality facing a huge loss of life, human displacement within and across borders. In fact several reports, including those by the African Union sand United Nations, demonstrated that violations of international human rights and humanitarian law have been committed by both parties in the conflict. There have been attacks on churches, mosques, hospitals and United Nations bases. Plus, there have been extrajudicial killings, enforced disappearances, arbitrary arrests and detentions, and the incidence of rape and other acts of sexual violence. What is more, this report has also estimated that at least 50,000 people have been killed so far. Beyond doubt this is a very serious human right violation. Hence those who have committed this gruesome human right violation need to be accountable for their acts if one aspires sustainable peace in South Sudan. Given that justice and Accountability are a significant step towards nation building and a prerequisite for building trust among the South Sudanese people. In Fact, it offers platform for trust and understanding between former enemies who are ethnic majority, minority, marginalized and indigenous groups. Plus, Justice and reconciliation is very mandatory for South Sudan for the reason that it offers the opportunity to begin addressing the unmet demands for justice. Therefore, this article will dwell on Justice and Reconciliation: the key to achieving peace in South Sudan.